Enable Breaking News banner for heat alert. (#1379)

There is currently a heat advisory, and we want to link to some timely
notices from the City of San Francisco in the SFSG whitelabel site. This
enables the Breaking News Banner and updates the previous text, which
was for a cold weather alert, to now mention the hot weather information
and an up-to-date link to the City's website.

app/components/ui/Banner.tsx

@@ -8,19 +8,18 @@ export const Banner = () => (
       <img src={icon("alert")} alt="attention" className={styles.alertIcon} />
       <div>
         <strong className={styles.title}>
-          SHELTER ACCESS DURING RAINY AND COLD WEATHER:
+          SHELTER ACCESS DURING HEAT RISK WEATHER:
         </strong>
         <p>
           <a
             className={styles.bannerLink}
             target="_blank"
             rel="noreferrer"
-            href="https://hsh.sfgov.org/services/how-to-get-services/accessing-temporary-shelter"
+            href="https://t.e2ma.net/message/evwfxh/mhfrepid"
           >
             Get information
           </a>{" "}
-          on expanded shelter access during cold and wet weather in San
-          Francisco.
+          on expanded shelter access during heat risk weather in San Francisco.
         </p>
         <p>
           <a

app/utils/whitelabel.ts

@@ -173,6 +173,7 @@ const SFServiceGuide: WhiteLabelSite = {
   intercom: true,
   loginEnabled: true,
   siteUrl: "https://sfserviceguide.org",
+  showBanner: true,
   showBreakingNews: true,
   title: "SF Service Guide",
   showReportCrisis: true,
@@ -199,6 +200,7 @@ const defaultWhiteLabel: WhiteLabelSite = {
   ...whiteLabelDefaults,
   intercom: true,
   loginEnabled: true,
+  showBanner: true,
   siteUrl: "https://askdarcel.org",
   showBreakingNews: true,
   title: "SF Service Guide",